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How does one start with this WCG thing? I've read the website and I wanna help out

Some newbie questions:

1. Do I have to leave the computer open all the time when WCG is doing the computation?
1.5 Or only when I use the computer?
2. Would WCG make my system slower?
3. Can I still game while WCG is on?
4. Would a slow internet connection hinder in WCG?

1: The computer needs to be running to do computation.
2: It can make it slower. Depends on your computer and what you are doing.
3: Again, it depends on the game and your personal feeling. Some people like to stop it while playing. I personally don't.
4: Don't think so. Though might want to opt out of Clean Energy Project - Phase 2, since that project have large work units.